Image-adaptive watermarking using 2-D chirps.

Linear chirps, a special case of polynomial phase
exponentials, have recently been proposed for digital watermarking.
In this work, we propose a known-host-state
methodology for designing image watermarks that are robust
to compression. We use a two-dimensional frequencymodulated
chirp as a spreading function in a block-based
spatial watermarking scheme. In each block, the chirp is
used to embed binary phase information. Chirp parameters
allow for spectral shaping of the watermark to match host
content. Since host state is known to the embedder, it is
possible to tune the chirp for optimum performance, particularly
against compression. In contrast to existing chirp
watermarking where only a single watermark is generally
embedded, the proposed block chirp watermarking allows
for a much higher payload. Detection is done using chirp
transform subject to key exchange for security.We show that
the proposed method significantly outperforms non-adaptive
watermarking across all compression factors under variety of
attacks.

Linear chirps, a special case of polynomial phase
exponentials, have recently been proposed for digital watermarking.
In this work, we propose a known-host-state
methodology for designing image watermarks that are robust
to compression. We use a two-dimensional frequencymodulated
chirp as a spreading function in a block-based
spatial watermarking scheme. In each block, the chirp is
used to embed binary phase information. Chirp parameters
allow for spectral shaping of the watermark to match host
content. Since host state is known to the embedder, it is
possible to tune the chirp for optimum performance, particularly
against compression. In contrast to existing chirp
watermarking where only a single watermark is generally
embedded, the proposed block chirp watermarking allows
for a much higher payload. Detection is done using chirp
transform subject to key exchange for security.We show that
the proposed method significantly outperforms non-adaptive
watermarking across all compression factors under variety of
attacks.

publishDate

2010

normalized_sort_date

2010-01-01T00:00:00Z

dc_date_str

2010

license_str

protected

REPOSITORYNAME

FgsRepos

REPOSBASEURL

http://hades.library.villanova.edu:8088/fedora

fgs.state

Active

fgs.label

Image-adaptive watermarking using 2-D chirps.

fgs.ownerId

diglibEditor

fgs.createdDate

2013-01-22T02:45:56.171Z

fgs.lastModifiedDate

2013-12-05T17:02:38.706Z

dc.title

Image-adaptive watermarking using 2-D chirps.

dc.creator

Zhang, Yimin.
Mobasseri, Bijan G.
Dogahe, Behzad M.
Amin, Moeness G.

dc.description

Linear chirps, a special case of polynomial phase
exponentials, have recently been proposed for digital watermarking.
In this work, we propose a known-host-state
methodology for designing image watermarks that are robust
to compression. We use a two-dimensional frequencymodulated
chirp as a spreading function in a block-based
spatial watermarking scheme. In each block, the chirp is
used to embed binary phase information. Chirp parameters
allow for spectral shaping of the watermark to match host
content. Since host state is known to the embedder, it is
possible to tune the chirp for optimum performance, particularly
against compression. In contrast to existing chirp
watermarking where only a single watermark is generally
embedded, the proposed block chirp watermarking allows
for a much higher payload. Detection is done using chirp
transform subject to key exchange for security.We show that
the proposed method significantly outperforms non-adaptive
watermarking across all compression factors under variety of
attacks.

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